摘要
采用通过大气颗粒物组分站监测数据及激光雷达探测技术,分析了衡阳市2023年1月10~12日重污染过程的污染物浓度特征,PM_(2.5)组分特征及污染物垂直分布、迁移情况,为衡阳市重污染天气预警预报及应对提供思路。结果表明:2023年1月10~12日污染过程共持续62 h,其中9 h轻度污染、19 h中度污染、27 h重度污染、7 h严重污染,重污染时段占污染时段50%以上;通道城市PM_(2.5)浓度有明显的先后时序特征变化;风速0.80 m/s以上时,对污染物有明显输送作用,湿度80%以上易于生成重度及以上污染;PM_(2.5)组分高值时段硝酸根离子占比达30%左右。指出了此次重污染天气是受外源污染物输入、本地污染贡献叠加不利气象条件导致,外源污染物输入为主,不利气象条件延长了污染持续时间,本地污染贡献叠加为重污染天气的产生提供了助力,生态环境部门有必要提前介入应对重污染天气。
Based on the monitoring data of the atmospheric particulate matter composition station and the lidar detection technology,this paper analyzes the pollutant concentration characteristics,PM_(2.5) composition characteristics and the vertical distribution and migration of pollutants during the heavy pollution process in Hengyang City on January 10~12,2023,providing ideas for the early warning,prediction and response of heavy pollution weather in Hengyang City.The study showed that the pollution process lasted 62 hours from January 10 to 12,2023,including 9 hours of mild pollution,19 hours of moderate pollution,27 hours of severe pollution,and 7 hours of serious pollution.The heavy pollution period accounted for more than 50%of the pollution period;The PM_(2.5) concentration in the channel cities has obvious sequential characteristics;When the wind speed is more than 0.80m/s,it has obvious transport effect on pollutants,and the humidity is more than 80%,which is easy to generate serious or more pollution;Nitrate ion accounts for about 30%during the high value period of PM_(2.5) component.The results show that the heavy pollution weather is caused by the combination of external pollutant input and local pollution contribution and adverse weather conditions.The external pollutant input is dominant,and the adverse weather conditions extend the pollution duration.The local pollution contribution superposition provides assistance for the generation of heavy pollution weather.It is necessary for the ecological environment department to intervene in advance to deal with the heavy pollution weather.
作者
刘卫
曹微
李笔红
Liu Wei;Cao Wei;Li Bihong(Hunan Hengyang Ecological Environment Monitoring Center,Hengyang,Hunan 421001,China;Hengyang County Social Drug Control Affairs Center,Hengyang,Hunan 421001,China)
出处
《绿色科技》
2023年第6期106-110,共5页
Journal of Green Science and Technology
